<!DOCTYPE html>
<html lang="zh">
<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<meta http-equiv="X-UA-Compatible" content="ie=edge">
	<title></title>
</head>
<body>
	<div id="dateTime"></div>
	<script type="text/javascript">
		Date.prototype.format = function(fmt){
			var o = {
				"y+":this.getFullYear(),
				"M+":this.getMonth() + 1,
				"d+":this.getDate(),
				"h+":this.getHours(),
				"m+":this.getMinutes(),
				"s+":this.getSeconds()
			};
			if(/(y+)/.test(fmt)){
				fmt = fmt.replace(RegExp.$1,(this.getFullYear() + "").substr(4 - RegExp.$1.length));
			}
			for(var k in o){
				if(new RegExp("("+ k +")").test(fmt)){
					fmt = fmt.replace(RegExp.$1,(RegExp.$1.length === 1) ? (o[k]) :(("00" + o[k]).substr(("" + o[k]).length)));
				}
			}
			return fmt;
		}
		document.getElementById('dateTime').innerHTML = new Date().format('yyyy-MM-dd hh:mm:ss');
		setInterval("document.getElementById('dateTime').innerHTML = (new Date()).format('yyyy-MM-dd hh:mm:ss');",1000)
	</script>
</body>
</html>